The big worry on such long term mortgages is that the debt to personal income ratio is very high indeed.
I have heard of figures of over five times personal income, but this was in the case of a student nurse whose income is certain to rise by several times. This is only one instance and the term was the usual 25 year one, but in theory 40 year mortgages should allow a lower rate of interest, and so higher borrowing.
It can make a good deal of sense in the current market, where plans to substantially increase the housing stock are not forseeable in the next decade.
It is likely that rents will increase as property values rise, and getting a rate of say 3 to 4% will soon end up costing less to service than rent.
The kicker though is what will happen to interest rates, one would expect to arrange a fixed rate for ten years or more, if rates rise significantly this could be disastrous if such a strategy is not adhered to.
My problem with all this is that in the end, no-one winds up any better off since everyone will be forced to the same way of raising money, and house prices will always rise to the amount that people can borrow, if that amount reaches a ceiling then house prices will also stop rising.
If you go back to the 50’s and 60’s there was a tendency to have one major income, and any second income was usually small by comparison and not taekn into account for calculating the amount a potential purchaser could access.
People intead gambled on large wage rises, because of inflation, to offset initially crippling mortgage costs.
As the second income grew the amount a borrower qualified for increased, but this just pushed up house prices even faster than the rate of inflation.The result is that now it takes two good incomes to finance a house purchase, if one income is lost then the remaining income cannot support the debt, which is partly what happened in the 80’s when there were large scale redundancies, and when the finacial pressure is on, then relationships feel the strain, exarcerbating the problem.
If you move the current scenarion on further, it seems to me that families will have to stay under one roof, children will not be able to move out, there will be those who inherit property from family, and those who started off on the council estates will just have that role reinforced, and the stratfication of British society will become ossified.
This is bound to lead to social tensions, in places such as Burnley and Bradford, Asians and other ethnic groups tend to inhabit the less salubrious areas of town, and this does lead to social isolation, and the creation of an underclass.
This is given a racial gloss by those who wish to exploit such things, but the reality is that it is a class issue rather than racial, its just that ethnic minorities find themselve in the lowest income groups.